Caltech’s prize-winning solar-powered toilet – video

A video demonstrates the working of the prototype of the solar-powered toilet that won the first prize of US$ 100,000 in the Reinventing the Toilet Challenge issued by the Bill and Melinda Gates Foundation. The Solar-Powered Self-contained Human Waste Water Treatment System was developed by Prof. Michael Hoffmann‘s research group at the California Institute of Technology (Caltech).

In 2011 the Caltech team was awarded a US$ 400,000 grant to create a toilet that can safely dispose of human waste and reuse water for just five US dollar cents per user per day.

Solar energy powers an electrochemical reactor, which converts human waste into fertiliser and hydrogen, which is stored in hydrogen fuel cells as energy. The treated water can be reused to flush the toilet or for irrigation.

The toilet, which could cost US$ 1,000 or more per unit according to the Seattle Times, is still a prototype and would need to be adapted before it can be launched commercially.

2 responses to “Caltech’s prize-winning solar-powered toilet – video”

Wow!! This is quite a break through, how is it that last year there was a toilet that did all of this for only 5 cents a day? That should be invested in.
We shouldn’t just endorse on one type of solar invention per item, I feel.

Dear all, great, to read these posts about your work in the sector, thank you for sharing! We would like to include this thread in the upcoming SuSanA news mail and make a collage from all the profile pics. If you have any objections against the use of your profile picture in the newsmail kindly let us know in the course of this week, no problem. Best wishes […]

Hi Elisabeth, Regarding the question of sludge management in ponds, in my last revision I had clarified the issue of removing frequency for the three different types of ponds (anaerobic, facultative, maturation). Now I added a paragraph (last one in the section Operation and Maintenance) describing the different desludging techniques. I edited directly in Wi […]

Hi Imad, thanks for your post and presenting your solution. I don´t really understand how your toilet system works. On your website you state this: "The solid waste will be treated by our special formulated bacterial culture, which eventually will turn into ashes, killing all the pathogens." 1) What is that bacterial culture? Why do you need more b […]

Hi David, thanks for your response and now I am curios and want to know how you do this. I assume your organization is Sanitation First, correct? How does the toilet looks like in the inside? Does it has 3 compartments including urine and wash water separation? Could you present a picture? Did you come across severe misuse? Meaning that, the feces were to we […]

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